Numerical control system real-time synchronization network controller and communication control method

A network controller and real-time synchronization technology, which is applied in digital transmission systems, data exchange networks, synchronization devices, etc., can solve problems that cannot meet the requirements of strong real-time and strong synchronization data transmission of CNC machine tools, and achieve communication load reduction and versatility Good, effect of lightening the burden

Inactive Publication Date: 2007-12-05
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because Ethernet is developed for large data volume and non-real-time data transmission, the uncertainty in the data transmission process cann

Method used

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  • Numerical control system real-time synchronization network controller and communication control method
  • Numerical control system real-time synchronization network controller and communication control method
  • Numerical control system real-time synchronization network controller and communication control method

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Embodiment Construction

[0045] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0046] Figure 1 is a schematic structural diagram of a real-time synchronous network controller; the real-time synchronous network controller includes an Ethernet switch chip, a central processing unit and a network connection interface, wherein:

[0047] (1) The Ethernet switch chip includes 8 physical layer protocol modules, 9 media access control layer protocol modules, switching engine modules, and media-independent interfaces; use Realtek's RTL8039SB (working temperature 0°C to 70°C), or Choose other switch chips with media independent interface MII;

[0048] (2) The central processing unit CPU includes a timer, a memory, a real-time clock module and a media-independent interface; the CPU is AT91SAM7X256 (-40°C to 85°C) from atmel, and other CPUs with Ethernet interfaces can also be selected;

[0049] (3) The network connection interface selects the RJ45 i...

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Abstract

Purpose of the invention is to connect the access devices at bottom layers of digital control systems, which possess Ethernet interface, to implement high synchronous information transmission in strong real time. The disclosed network controller includes chips of Ethernet exchange, CPU, and network connection interface. The communication control method includes step of system initiation, and step of communication. The step of communication repeats following communication cycle: (1) sending out synchronous message; (2) sending out follow message; (3) each slave station sends out up going message in turn; (4) sending out the combined up going message crated by assembling going messages to main station; (5) main station sends out generic down going message. Using general Ethernet chip, the invention possesses good generality. For digital control system with 16 axes, the method provides interpolation cycle being as 0.5 ms, and synchronization error less than 1 micro second.

Description

technical field [0001] The invention belongs to a communication control device and method, in particular to a numerical control communication device and method for precise time synchronization of real-time Ethernet, suitable for realizing internal interconnection of numerical control equipment through real-time Ethernet, and realizing strong synchronization and strong real-time information transmission. Background technique [0002] In the CNC system, the traditional way for the internal controller to transmit commands to the servo driver is in the form of pulse train or analog voltage. This control method is only suitable for occasions where the processing speed and control accuracy of CNC machine tools are not too high, and it is difficult to meet the needs of multiple channels. , high-speed, high-precision processing requirements. In order to improve processing speed and processing accuracy, digital communication methods, such as field bus, are required between the intern...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04L7/00H04L12/56
Inventor 唐小琦白玉成陈吉红李银刚张向利任清荣周会成周向东
Owner HUAZHONG UNIV OF SCI & TECH
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